US2661334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-in-oil emulsion drilling fluid
Assignee: STANDARD OIL AND GAS Co
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Filing: 1952-02-11
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Granted: 1953-12-01
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Expires: 1972-02-11
Abstract
No abstract record available.
Inventors
- 👤 Lummus James Lawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:17
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/32; C09K8/36; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/06; Y10S516/905; Y10S516/907; Y10S516/917; Y10S516/918
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A STABLE WATER-IN-OIL EMULSION DRILLING FLUID COMPRISING FROM ABOUT 40 TO ABOUT 75 PARTS BY VOLUME OF WATER, AND FROM ABOUT 25 TO ABOUT 60 PARTS BY VOLUME OF OIL, SAID EMULSION DRILLING FLUID CONTAINING AT LEAST 2.5 POUNDS PER BARREL OF AN OIL-SOLUBLE, NON-IONIC, SURFACE-ACTIVE ESTER OF A POLYHYDRIC ALCOHOL WITH AN ACID HAVING AT LEAST TWELVE CARBON ATOMS TO THE MOLECULE AND SAID EMULSION DRILLING FLUID ALSO CONTAINING AT LEAST 0.1 POUND PER BARREL OF A WATER-SOLUBLE, NON-IONIC, SURFACE-ACTIVE AGENT.
Claim 2
Dependent Claim
82 words
A STABLE WATER-IN-OIL EMULSION DRILLING FLUID COMPRISING FROM ABOUT 40 TO ABOUT 75 PARTS BY VOLUME OF WATER, AND FROM ABOUT 25 TO ABOUT 60 PARTS BY VOLUME OF OIL, SAID EMULSION DRILLING FLUID CONTAINING AT LEAST 2.5 POUNDS PER BARREL OF AN OIL-SOLUBLE, NON-IONIC, SURFACE-ACTIVE ESTER OF A POLYHYDRIC ALCOHOL WITH AN ACID HAVING AT LEAST TWELVE CARBON ATOMS TO THE MOLECULE AND SAID EMULSION DRILLING FLUID ALSO CONTAINING AT LEAST 0.1 POUND PER BARREL OF A WATER-SOLUBLE, NON-IONIC, SURFACE-ACTIVE AGENT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |